Cap for tire-valves, &amp;c.



no. 657,57l. Patented saw. u, lead. a. H. r. SCHBADER.

CAP FOR TIRE VALVES, &c.

Appfication filed Apr. 25, 1898. Renewed my 5, 1900.)

(No Model.)

| TERS co PuoTouTHu, wAsnlno'ron, 0. c4

UNITED STATES PATENT OF CE.

GEORGE H. F. SCHRADER, OF NEW YORK, N. Y..

cAP FOR TIRE-VALVES, 8pc.

SPECIFICATION forming part of Letters Patent No. 657,571, dated. September 11, 1900.

Applicatiomfiled April 25, 1898. Renewed May 5, 1900, Serial No. 15,647. .No model.)

To all whom it may concern:

Be it known that I, GEORGE H. F. Scena- DER, a citizen of the United States, residing in the city, county, and State of New York, have invented certain new and useful 1111- provements in Caps for Tire-Valves and the Like, of which the following is a specification. This invention relates to caps for tire andother valves, and aims to provide certain improvements therein. V

Heretofore it has been common to construct tire-valves'with a screw-threaded socket and an externally-screw-threaded end, providing. a valve-stem projecting from the interior out, into the socket and terminating some distance within the end thereof, which stem for de, flating the valve could be pressed inwardly a deflating-tip formed on the head of a valvecap. The cap has usually been an internallysc'rew-threaded cover adapted to screw over the end of the valve shell and formed at its upper end with a flat top wall on which a fiat metal disk was seated, below which disk a flat washer, of rubber or other packing material, has been located,the packing-washer being designed to press against the end of the valveshell when the cap is screwed home to make a tight closure and the metal disk acting as a swivel or antifriction member between the packing-washer and cap to prevent twisting or distortion of the packing-washer during screwing on and off of the cap. It has been diflicult to upset the end of the valve-stem, so that it would not fall into the valve-chamher, because as the end terminated within the socket a very small tool was necessary to grasp it therein. It has also been found that in time the end of the valve-shell has so cut into the packing-washer that when screwing the cap tightly homethis washer-has bulged into the socket sometimes a sufficient dis-- tance to strike the end of the valve-stem and unseat the valve My invention aims to provide means whereby avalve-stem projecting beyond the valve-shell can be employed, means insuring against deflation of the valve by the packing-washer, and an improved construction of packingwasher, antifrictiondisk, and cap. Tothis end in carrying out the preferred form of my invention I provide a packing-washer having a fiat peripheral the washer outwardly, so that the center of its body is dome-shaped,and I provide an .antifriction metal washer having an annular flat portion resting on the flange of the packing-washer and transmitting the pressure of the cap thereto and preferably having a domeshaped central portion corresponding with the convex top of the washer, and I preferably construct the cap with an internallyconcave top corresponding substantially in contour with the contour of the washer and ?ring. by inserting a special tool=-as, for example, j

In the accompanying drawings, which show certain adaptations of my invention, Figure 1 is a side elevation of a tire-valve provided with the preferred form of my present improvements, a fragment of the tire being :shown in section.

Fig. 2 is a fragmentary side elevation of such a valve, showing the 1 upper end and-the cap applied thereto in axial section. axial section, of the valve, showing the cap removed and inverted for pressing the stem Fig. 3 is a side elevation, partly in inwardly to deflate the valve. Figs. 4, 5, and 6 are'respectively axial sections of the cap, the antifriction member, and the disk, respectively. Fig. 7 is a view corresponding to Fig. 2, showing a modification in which the antifriction member consists of an annular plate through the center of which the dome of the washer passes; and Fig.8 is a similar view 'showin g the use of the cap and packingwasher without the antifriction member.

. Referring to the drawings, let A indicate a pneumatic tire or other vessel; B, a valve-. :shell applied thereto; 0, a cap for the outer end of this shell; D, a packing-washer in the icap; E, an antifriction member above the. f packing-washer; F, the top of the cap; G, the external screw-thread on the shell; H, the internal thread on the cap; I, the outer end of the shell, and J the valve-stem. These parts may be of any suitable or general construction and operation, those shown being in their general features of ordinary construction.

According to one feature of my present improvements the packing-washer D is con- 2 y v 657,571! I structed with; a, substantially -flatl annular. edge orseating-flange at, having wide flat top and bottom faces 0 and b, inwardly of'which the top surface 0 of the washer. is of rubber orother suitable material and is adapted to be sprung into the cap O and ,heldtherein with its bottom face I) opposed to the end I of the shell B and its concavity d pp s e the end; of the valvestem J The Washer is clamped with a leaky-tight joint against the valve'shell by pressure exertedon the top surface 0 of the washer with the screwing on of the cap.

.According to another feature of improvement the. antifriction member is provided with an annular bearing portion f, adapted to rest on the top 0 of the flange A of the washer, and with a recess 9 opposite the concavity d of the washer and preferably of suitable size to freely receive the dome e of the latter. The antifriotion member is adapted to transmit the pressure of the cap to the flange 0, of the washer and permit rotation of the cap'independently of the washer. In its preferred form the antifriction member consists of a plate or disk of sheet metal pressed or stamped into such form that its edge shall constitute shall be of inverted-cup shape, so that on'its under side it shall have the recess 9 and on its top it shall have a dome h. 1 According toanother feature of improve ment, the cap 0 is constructed with an aunt lar bearing-face v; arou nd the edge of the-inner (side of its top F and-with a concavity jinward'ly of this hearing portion. The bearing portion and cavity are preferably of such con-- tour that they will substantially fit the antifriction member E throughout its upper surface. gle piece of imperforat'e sheet metal spun, stamped, or pressed intoa hollow cup-having an internal washer-chamber Z at top, to which the internally-screw-threaded socket 'ml'eads,

a contraction or shoulder'n between the socket and" chamber serving toretain the pack-' ing-washer and the anti-friction. member in place when they are applied to the cap. a In hangs the shoulder 71., and the packing-washer is sprung through the socket m andall'owed.

toexpandin the chamber Z,fso that its edge overhangs the shoulder at. Externally --'tl'1e cap has a knurled orhand'le-portion 0 between an upwardly-projectingdome p and the contracted and cylindrical lower part 9.

In use the concavity din the bottom of the washerD- will permit projection of the outerend of thevalve-stem' J when the valve is seated, to av pointflush' with or considerably The cap is preferably formed of a sinwhere it call-be. flattenedrwi th any ordinary tool and where itc'an be-reached-bythe'finger for pressing it inward for deflation. The compression of the packing-washer to make a tight fit cannot bulge the Washer inwardly against the. stem. Consequentlyall danger of accidental'deflation' or un'seatingof the valve will beavoided. The pressure on the packingwasher'being confined to the flange thereof avoids danger ofimpairment or puncture of :ing Q11 .01? off the cap it will turn on the antifriction member without distorting or im pairing the washer.

The improved caps can be cheaply and easily made, and will be of great lightness and compactness. The improved packing-washer constitutes a new article. of manufacture, which can be readily and advantageously applied to any suitable valve.

It will be seen that my invention provides improvements which can be readily and advantageously availed of, and it will be understood t'hat the invention is not limited to the particular details of construction, arrangement, and combination set forth as constituting the preferred form of the invention, since it can be employed in whole orin part, according to such modifications as circumstances or the judgment of those skilled in the art may dictate, without departing from the spirit of the invention.

WhatI claim is" In caps for tireand other valves, a cap 5 adapted to screw over theend of a valve-shell, in combination with apacking-washer within the cap having an annular bearing-face for being-"clamped bythe cap against the end of the valve-shell, and having'a central recess inwardly of such face for receivi-nga valvestem'. r 2. In caps for tire and other valves, an internallymhreaded cap,in combination with a ipacking-washerthere-in having an annular outer bearing 'do-in-er I v 3; In caps'for tirean-d other valves, an internall'y-threaded cap and a'pack'ing-washer therein, incombiuation with an antifriction )memberwithin the cap between "the latter -and said washer, having an annular bearing porti-on engaging the edge of the" washer for transmitting tos'uch'edge the pressure of the icap when it is screwed on a valve-shell and having a recess in wardl'yof such portion.

4. 111 tire and other valves, a valve-shell fand a stem the-rein,- in'combinati'onwith a cap sc-rewin-g over-the' end of such shell and if havingan annularbearing portion and. a central cavity within its upper end'oppositesa-id stem, and'la packing-washer carried by said cap, and adapted tojbe pressed aroundits edge by'thean-nu-larbearing-portion thereof against the'end of such shell.

Q. 5. In caps-for tire and other valves-,1 afiel- 1 0 cap and a packing-washer therein, in

the center or body portion thereo f, In screw- IIO.

portion, and a hollow central 'a combination with anantifrictionmember hav ing a smooth annular bearing portionjsurrounding its edge, and having a recessoppooaps, having a smooth outer bearing edge f, a central recess 9 on its under face, and a M curved dome h at its center on its upper face. 8. The improved article of manufacture consisting of a valve-shell, a stem projecting therefrom, a cap screwing over the end of such shell, and a packing-washerin said cap, having an annular outer bearing portion adapted to be clamped against the end of such shell, and having acentral recess opposite said stem.

9. The improved article of manufacture consisting of the packing-Washer D having an outer annular bearing-flange a, a dome e on one side, and a central concavity d opposite said dome and on its flat side.

Inwitness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

GEO. H. F. SOHRADER.

Witnesses: I V V GEORGE H. FRASER, FRED WHITE. 

